<template>
  <div class="tab-bar-item" @click="itemclick">
    <!-- 当isActive为true就显示else的,因为组件active的图片是在第二张，代替的是第二个插槽 -->
    <div v-if="!isActive"><slot name="item-icon"></slot></div>
    <div v-else><slot name="item-icon-active"></slot></div>
    <div :style="activeStyle" ><slot name="item-text"></slot></div>
  </div>
</template>

<script>
export default {
  name: "TabBarItem",
  props:{
    path:String,
    activeColor:{
      type:String,
      default:"red"
    }
  },
  data(){
    return {
      // isActive:true
    }
  },
  computed:{
    isActive(){
      //判断当前的路径，和props的path值一不一样,如果一样，就返回true
      return this.$route.path.indexOf(this.path)!==-1;
    },
    activeStyle(){
      //上面的值是true就绑定style，不为true就返回{}
      return this.isActive ? {color:this.activeColor} : {}
    }
  },
  methods:{
    itemclick(){
      this.$router.push(this.path)
    }
  }
};
</script>

<style>
.tab-bar-item {
  flex: 1;
  text-align: center;
  height: 49px;
  font-size: 14px;

}
.tab-bar-item img {
  width: 24px;
  height: 24px;
  margin-top: 3px;
  vertical-align: middle;
  margin-bottom: 2px;
}

</style>